Analog Security Camera System with PIR Thermal Detection
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Solution Overview
Problem
Security camera systems face inaccuracies in detecting relevant movement due to false triggers from inconsequential changes, such as light variations and non-human movements, and are costly due to reliance on digital cameras and PIR sensors.
Innovation Solution
A security camera system that combines analog video transmission with infrared radiation detection, using a PIR detector circuit and signal processor to generate a mixed analog signal, which is analyzed alongside pixel changes to accurately detect movement, reducing false triggers and implementation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel changes are monitored to detect movement, then motion detection capability is provided, but false triggers occur from inconsequential movement such as light variations and animal movement
Solution Approach 1:
The motion detection function is segmented into two independent detection methods: pixel-based motion detection and PIR-based thermal detection. Each method detects different aspects of movement, allowing the system to cross-validate results and filter out false triggers from inconsequential movement while maintaining sensitivity to relevant intrusions.
Solution Approach 2:
The PIR sensor acts as an intermediary thermal detection mechanism that complements pixel-based detection. By introducing this intermediate detection layer that measures thermal energy changes, the system can distinguish between relevant human movement and irrelevant environmental fluctuations, thereby improving overall detection reliability.
2Reliability
If PIR sensor and digital camera are used for accurate detection, then detection accuracy is improved, but system cost increases
Solution Approach 1:
The system merges analog video transmission infrastructure with PIR sensor technology in a cost-effective integration. By combining the existing analog camera system with PIR detection capabilities through a unified signal processing architecture, the system achieves improved detection reliability without incurring the full cost of a complete digital system upgrade.
Solution Approach 2:
The analog video transmitter is designed with multi-functionality, serving both traditional video transmission and PIR-based thermal detection. This universal design allows a single device to perform multiple detection functions, reducing the need for separate expensive digital camera systems while maintaining accurate motion and thermal detection capabilities.
3Measurement precision
If digital cameras are used instead of analog cameras, then detection capability is improved, but implementation cost increases
Solution Approach 1:
The system changes the detection parameter from purely visual (pixel-based) to include thermal energy detection (PIR-based). This parameter change allows the use of analog video transmission infrastructure while achieving enhanced detection capabilities through thermal sensing, avoiding the need for expensive digital camera upgrades.
Solution Approach 2:
The system substitutes thermal energy detection (PIR) for purely optical/mechanical digital video processing. By replacing the need for expensive digital camera processing with analog video transmission combined with thermal sensing, the system achieves comparable or superior detection capability at lower implementation cost.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves reliable and accurate detection of relevant movement with a significant reduction in false triggers and lower implementation costs by using analog signal processing and dual motion detection methods.
Implementation Method 1
a PIR detector circuit for measuring infrared radiation within the designated area
Implementation Method 2
a pyroelectric infrared radial (PIR) sensor circuit
Data Source
AI summary
A security camera system for safeguarding a designated area includes at least one camera for encoding and transmitting streaming video of the designated area, and a video receiver for receiving, decoding and analyzing the streaming video for relevant motion, such as movement indicative of the presence of a person. Upon detecting a motion event, the video receiver triggers an alert condition, which results in storing each video steam into memory. Each camera is provided with a PIR detector circuit for measuring infrared radiation within the designated area, the video steam and IR data being transmitted to the receiver via analog communication means to reduce implementation costs. To minimize the risk of false trigger events, the receiver monitors both pixel changes in the streaming video signals as well as measured IR radiation levels within the designated area that fall within the traditional thermal energy range of human body heat.